Plasma norepinephrine samples were obtained before and after exposure to auditory stimuli reminiscent of combat from two groups of male Vietnam veterans with combat experience: one with diagnoses of PTSD (N = 15) and one with no mental disorder (N = 6). Results showed a significant 30% rise in plasma norepinephrine for the PTSD group, with no change in the comparison group.
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Blanchard et al. (1991) studied this question.
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